含稀土磷矿酸浸出稀土及杂质

Leaching of Rare Earth and Impurities in Phosphorite Ore by Acid

研究了硫磷混酸分解含稀土磷矿时稀土和杂质的浸出行为.结果表明,磷酸浓度为8.6 mol/L、浸出时间3 h、硫酸过量系数1.00、温度80℃、液固比6:1 L/g的条件下,织金和矾山磷矿中稀土氧化物浸出率分别为62.73%和52.84%.在一定范围内,两地磷矿中稀土浸出率随时间和液固比增大而增大,随硫酸过量系数和温度增加先增后减,主要轻稀土组分(Y2O3,La2O3,Ce O2,Nd2O3)浸出率随原子序数增大而减小,矿石种类不同,稀土进入磷酸溶液中的规律相同.

The leaching law of rare earth and impurities in the process of decomposition of phosphate ore containing rare earth by mixtures of sulfuric and phosphoric acids was studied. The results showed that leaching rates of rare earth oxides in Zhijin phosphate ore and Fanshan phosphate ore are 62.73% and 52.84%, respectively, under the conditions of concentration of phosphoric acid of 8.6 mol/L, 3 h leaching time, excessive coefficient of sulfuric acid of 1.00, temperature at 80℃, liquid-solid ratio at 6：1 L/g. Within a certain range, the leaching rates of rare earth in two phosphate ores increase with the increasing of time and liquid-solid ratio. The leaching rate both increase at first and then decrease with the increasing of temperature and excessive coefficient of sulfuric acid. The leaching rates of the main components（Y2O3, La2O3, Ce O2 and Nd2O3） in light rare earth decrease with the increasing of atomic number. Although ores are different, the law of rare earth leached out to the phosphoric solution is the same.